WILLIAMS: LARRID^ OF KANSAS. 181 



at the dorsal base of the glossai and is somewhat V-shaped in 

 cross section, sending out a ventral arm (/) to either side to 

 connect the piece with the thin paired plates (e, figs. 7 and 8). 

 These are situated at the base of the mentum and are also 

 connected with the two lateral pieces (d). There is, in addi- 

 tion, a more or less central arched piece, throujjh the curve of 

 which the tube of the salivary glands passes. 



Paraglossai. (PI. XXIII, figs. 7 and 8, PGL.) These arise 

 from the two partly free dorsal chitinized lobes (i), and ex- 

 tend ventrad on either side as thin transparent processes 

 (fig. 8, PGL). The curved sclerite (h) lies in the inner mem- 

 brane of the piece i, and is secured to g near the base of its 

 posterior arm (/). • 



Mandibles. (PI. XXIII, fig. 7, MD, base; pi. XXV, figs. 21 

 and 22.) These are large and stout, bidentate within, and 

 with a distinct emargination exteriorly (on the lower side) 

 before the middle. In the male the mandibles are more slen- 

 der than in the female. 



How Food is Taken. 

 It may be well to mention, in the first place, that this 

 process was not observed ; the writer having given the mouth 

 parts considerable study, believes that his views are correct. • 

 To see how food is taken up by the mouth parts and conveyed 

 to the oesophagus, constant reference must be made to figures 8 

 and 11. The former figure we have just considered; the latter 

 is a somewhat diagrammatic dorsal view, chiefly of the labium. 

 As before stated, the epipharynx hangs down as a lobe from 

 the labrum, while ventrad of (opposite) the former is the 

 floor of the pharynx. It is between these two, therefore, that 

 the passage (o) to the esophagus extends. The anterior end 

 of the pharynx (p, fig. 11) is free; that is, extends forward as 

 a horizontal, let us say, lobe, below and behind which is a thin- 

 floored blind sac or pouch (t, fig. 8). Between the paired 

 lobes i and k is a longitudinal channel or groove (fig. 11), 

 which terminates posteriorly just before the aforesaid lobe 

 (p). The ligula at this point slopes down rather abruptly 

 (x, fig. 11) ; this is just about ventrad of p, figures 8 and 11, 

 the slope ending in the form of an emargination or arc (c), 

 with its center or inclined floor (as viewed from above) di- 

 rected anteriorly. The anterior edge of the pharyngeal lobe 

 (both figures) can be made to fit this emargination or curve 



